Question

Розв'яжи рівняння а)х-1/2=1/6+4/5 б)1/6+y=7/10-2/5

Answer 1

$a)x - \frac{1}{2} = \frac{1}{6} + \frac{4}{5} \\ x = \frac{1}{6} + \frac{4}{5} + \frac{1}{2} \\ x = \frac{1 \times 5 + 4 \times 6 + 1 \times 15}{30} \\ x = \frac{5 + 24 + 15}{30} \\ x = \frac{44}{30} \\ x = \frac{22}{15} \\ x = 1 \frac{7}{15} \\ b) \frac{1}{6} + y = \frac{7}{10} - \frac{2}{5} \\ y = \frac{7}{10} - \frac{2}{5} - \frac{1}{6} \\ y = \frac{7 \times 3 - 2 \times 6 - 1 \times 5}{30} \\ x = \frac{21 - 12 - 5}{30} \\ x = \frac{4}{30} \\ x = \frac{2}{15}$